yup, don't have a pic or screenshot handy. On a windows 7 at my desk atm. In explorer a window usually opens up when there is mixed media (secure/insecure) with edge it's a little icon in the task bar. pretty discreet really . looks like a little square with a shield in the bottom corner is the best I can describe it.

*the icon will only show itself on pages with that mixed media. otherwise it is not present